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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f74083b24518cc8e79d5e76ac24c56c85208addb72d116967ece56d31e486c' 
  AND token = 'd5lsWrlRX4vQt9O0Wky65yKfLENR1ApHlAy75RBv874=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}